Enable leader election in v1.14+

Use Deployment with leader election instead of StatefulSet

Deployment behaves better when a node gets disconnected
from the rest of the cluster - new provisioner leader
is elected in ~15 seconds, while it may take up to
5 minutes for StatefulSet to start a new replica.

Refer: kubernetes-csi/external-provisioner@52d1fbc

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

deploy/cephfs/kubernetes/v1.13/helm/templates/provisioner-clusterrole.yaml

@@ -0,0 +1,17 @@
+{{- if .Values.rbac.create -}}
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: {{ include "ceph-csi-cephfs.provisioner.fullname" . }}
+  labels:
+    app: {{ include "ceph-csi-cephfs.name" . }}
+    chart: {{ include "ceph-csi-cephfs.chart" . }}
+    component: {{ .Values.provisioner.name }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+aggregationRule:
+  clusterRoleSelectors:
+    - matchLabels:
+        rbac.cephfs.csi.ceph.com/aggregate-to-{{ include "ceph-csi-cephfs.provisioner.fullname" . }}: "true"
+rules: []
+{{- end -}}